Abstract: A numerical classification of climates in China is conducted using meteorological data of 30 years at 432 stations. The results are similar to those obtained before with the traditional methods. Thus it is feasible to apply the numerical method to climatic classification in China. In addition, the numerical classification expressed in numerals is objective and quantitative, and thus it is convenient to treat the meteorological data with computers in climate classification. The concept of similarity is also used to compare quantitatively among different climatic types.